Immunity Article The Intracellular B30.2 Domain of Butyrophilin 3A1 Binds Phosphoantigens to Mediate Activation of Human Vg9Vd2TCells Andrew Sandstrom,1 Cassie-Marie Peigne´ ,2,3,4 Alexandra Le´ ger,2,3,4 James E. Crooks,5 Fabienne Konczak,2,3,4 Marie-Claude Gesnel,2,3,4 Richard Breathnach,2,3,4 Marc Bonneville,2,3,4 Emmanuel Scotet,2,3,4,* and Erin J. Adams1,6,* 1Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL 60637, USA 2INSERM, Unite´ Mixte de Recherche 892, Centre de Recherche en Cance´ rologie Nantes Angers, 44000 Nantes, France 3University of Nantes, 44000 Nantes, France 4Centre National de la Recherche Scientifique (CNRS), Unite´ Mixte de Recherche 6299, 44000 Nantes, France 5Program in Biophysical Sciences, University of Chicago, Chicago, IL 60637, USA 6Committee on Immunology, University of Chicago, Chicago, IL 60637, USA *Correspondence:
[email protected] (E.S.),
[email protected] (E.J.A.) http://dx.doi.org/10.1016/j.immuni.2014.03.003 SUMMARY et al., 1999). In vitro, Vg9Vd2 T cells target certain cancer cell lines or cells treated with microbial extracts (Tanaka et al., 1994). In humans, Vg9Vd2 T cells detect tumor cells and mi- Vg9Vd2 T cell reactivity has been traced to accumulation of crobial infections, including Mycobacterium tubercu- organic pyrophosphate molecules commonly known as phos- losis, through recognition of small pyrophosphate phoantigens (pAgs) (Constant et al., 1994; Hintz et al., 2001; containing organic molecules known as phospho- Puan et al., 2007; Tanaka et al., 1995). These molecules are pro- antigens (pAgs). Key to pAg-mediated activation duced either endogenously, such as isopentenyl pyrophosphate of Vg9Vd2 T cells is the butyrophilin 3A1 (BTN3A1) (IPP), an intermediate of the mevalonate pathway in human cells that can accumulate intracellularly during tumorigenesis, or protein that contains an intracellular B30.2 domain by microbes, such as hydroxy-methyl-butyl-pyrophosphate critical to pAg reactivity.